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Depending on the strength of a character’s bloodline, he gains a new bloodline trait every one, two, or four character levels (or effective character levels, for characters with a level adjustment greater than +0). The traits gained are given in each bloodline description.
Bloodline Trait Descriptions
Bloodline traits fall into four categories.
Ability Boost: You gain a permanent +1 increase to the given ability score. This is similar to the ability increase gained by characters at every fourth level.
Skill Boost: You receive a +2 bonus on checks made with the given skill.
Special: You gain a special ability. Common bloodline special abilities include bonus feats, natural armor, special attacks (such as the ability to smite evil or smite good), special qualities (such as resistance to energy, spell resistance, or scent), or spell-like abilities.
If you already have a feat that a bloodline provides as a bonus feat, you may choose a different feat. For example, the minor celestial bloodline grants Alertness as a bonus feat at 8th level. If a character with this bloodline already has Alertness by the time he reaches 8th level, he can choose any other feat instead (subject to normal prerequisites, of course).